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Commitments and Contingencies (Details) - USD ($) $ in Millions		1 Months Ended			9 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Jun. 30, 2023	Sep. 30, 2022	Dec. 06, 2019	Dec. 31, 2014
Commitments and Contingencies
Unsecured credit facilities					$ 415.9
New York
Commitments and Contingencies
Contingency liability					146.0
Percentage of claim recoveries due to purchaser	10.00%
Percentage of claim recoveries due to seller	90.00%
Montana
Commitments and Contingencies
Damages sought			$ 132.0	$ 79.0
Damages sought, counter party		$ 93.0
Department of Energy | New York | Minimum
Commitments and Contingencies
Contingency liability					106.0
Department of Energy | New York | Maximum
Commitments and Contingencies
Contingency liability					146.0
Fund investment capital
Commitments and Contingencies
Commitment					$ 10.9
Commitment period					6 years
Standby letters of credit
Commitments and Contingencies
Outstanding standby letters of credit					$ 883.3	$ 640.3
Contingency liability					887.7
Surety Bond
Commitments and Contingencies
Contingency liability					4,600.0
Collectibility of Receivables
Commitments and Contingencies
Unapproved change orders								$ 103.0
Collectibility of Receivables | New York
Commitments and Contingencies
Unapproved change orders							$ 60.4
Collectibility of Receivables | New York | Minimum
Commitments and Contingencies
Damages sought					148.5
Collectibility of Receivables | New York | Maximum
Commitments and Contingencies
Damages sought					329.4
Collectibility of Receivables | Montana
Commitments and Contingencies
Unapproved change orders					90.0
Damages sought					$ 144.0

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The value of the award the counter party seeks in the legal matter.

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Percentage of claim recoveries and costs due to purchaser.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty.

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